Centering jig



R. W. BAKER GENTERING JIG Aug. 13, 1940.

Filed Jan. 18, 1989 Roger War UNITED s'rA'rss P'ENT FFICE CENTERING JIGRoger W. Baker, Mishawaka, Ind., assignor to George F. Martin, Jr.,Elkhart, Ind.

Application January 16,

4 Claims.

This invention relates to gages or jigs; and more particularly to acentering jig for use With a drill or other tool.

An object of this invention is to provide an improvedV jig for use witha tool such as a drill or the like which is so constructed that it canbe readily engaged with either a round, square or' rectangular articleso as to securely hold a drill or other tool relative to the article.

Another' object of this invention is to provide va jig of this kindwhich is capable of ready adjustment so that the jig can be easily andquickly adjusted to engage articles of various sizes and types.

A further object of this invention is to provide a jig of this kindwhich is provided with a bushingstructure in the center thereof, thebushing structure being pr'essed or otherwise firmly mounted within asupporting block so that where it is desired to use different sizes oftools or drills, which are adapted to pass through the bushing, theblock may be engaged with the remaining structure which embodies adifferent size bushing.

A still further object of this invention is to provide a jig of thiskind which may be used to center a tool relative to an article to beworked upon, the jig being so constructed that it may engage either theinterior or' exterior of the article which is being worked upon.

To the foregoing objects and to others which may hereinafter appear, theinvention consists of the novel construction, combination andarrangement of parts as will be mor'e specifically referred to andillustrated in the accompanying r drawing, wherein is shown anembodiment of this invention, but it is to be understood that changes,modifications and variations may be resorted to which fall within thescope of the invention as claimed.

In the drawing:

Figur'e 1 is a perspective view of a jig constructed according to anembodiment of this invention,

Figure 2 is a sectional view taken on the line 2-2 of Figure 1,

Figure 3 is a fragmentary sectional View taken on the line 3-3 of Figure1, and

Figure 4 is a fragmentary sectional view taken on the line 4-4 of Figure1.

Referring to the drawing, the numeral III designates generally asupporting block which in the present instance, is constructed of metaland is provided With a pair of openings I I therethrough. ,The openingsII are in parallel relation to each 1989, serial No. 251,273 (ci. 77-62)which one end of the rod I2 is adapted to enz gage. The rod |2 in the'present instance is adapted to be pressed or otherwise firmly mounted inthe opening I5 of the lug Id and is adapted to extend downwardly atright angles to the length of the rod I2. Each rod I2 is adjustably 1secured in the block III by means of a set screw IG which engages in athr'eaded opening I'I provided in the block Ill. The set screw IB is ofthe type wherein a countersunk socket is provided in the outer endthereof in which a key or plug wrench is adapted to engage.

The block IO is also provided with a second pair of openings I8 whichextend in parallel relation to each other through the block IO and atright angles to the openings. I I. The openings I are positioned abovethe openings I I and an elongated' rod |9 similar to the rod |2 isad'apted to engage in an opening I8. The rods I9 are substantially ofthe same length as the rods I2 and on the under side thereof each rod IBis provided with a flat longitudinally extending face 20. The block IOis provided with a threaded opening 2| for each rod I9 in which a setscrew 22 is threaded and engages the fiattened surface ZI] of the' rodIB so as to adjustably hold a rod I9 relative to the: block IO, The setscrews 22 are similar to the set screws IB, being provided with acountersunk socket in which a suitable plug wrench is adapted to engage.The rods I9 at one end thereof are provided with a lug 23 having. anopening 24 in which the rod I9 engages. The rod I9 may be pressed orotherwise firmly positioned in the opening 24 so that the lugs 23 Willbe disposed in a Vertical position when the block IO is in a horizontalposition. The set screws IIi and 22 are adapted to, at all times, holdthe rods I2 and I9 with the lugs I4 and 23 thereof at right angles tothe upper face of the block IO.

The block IO in' substantially the center thereof is provided with anopening 25 therethrough in which a pair of bushing members 26 areadapted to engage. The bushing members 26 are pressed or otherwisefirmly mounted in the block II! and in the present instance, there aretwo of these bushings 26 which are pressed into the block l from theopposite faces thereof. The bushings 26 are provided with a bore 21therethrough in which a tool such as a drill or punch is adapted toengage so as to hold the drill or tool in an operative position.

In the use of this jig the rods IZ and IS are adjusted relative to theblock ID and to each other so that the axis of the bore 27 will bepositioned properly relative to the article which is being worked upon.The lugs Ill and 23 may engage the exterior surface at one end of acylinder or other round object or if desired, these lugs I 4 and 23 mayengage Within the interor of a cylinder. It will also be understood thatthese lugs Ifi and 23 may engage adjacent sides of a square or rectangleso as to position the axis of the bore 21 of the bushings 26 in thedesired location relative to the article which is being worked upon. Theadjustment of the rods I2 and lg is effected by adjustment of the setscrews IG and 22 so that these rods 12 and l9 may have the lugs M and 23respectively projecting beyond the block IG for an equal distance or ifdesired, the rods l2 may project beyond the block l for a distancedifferent from the rods 49, this adjustment being dependent on thelocation of the hole which is to be drilled in the article to be workedupon. This jig is of an exceedingly simple construction so that it canbe manufactured at a relatively small cost and due to the readyadjustment of the several parts thereof the jig can be used for variousarticles and When once adjusted will accurately position the axes of thebushings 26 in the proper relation to the article which is being workedupon. While I have shown the bushings 26 as being firmly mounted in theblock l, if desired, these bushings may be releasably mounted therein bywell known means.

What I claim is:

l. A jig as set forth comprising a block member provided with pairs ofright angularly related openings therethrough disposed parallel Withopposite faces of the block, rods disposed in said openings andprojecting beyond the adjacent edges of the block, threaded meansclamping said rods in said openings, and right angularly disposedarticle engaging members carried by an end of each rod.

2. A jig as set forth comprising a block memher provided with rightangularly related openings therethrough disposed parallel with oppositefaces of the block, rods disposed in said openings and projecting beyondthe adjacent edges of the block, each of said rods having a flatlongitudinally extending surface, a right angularly disposed articleengaging member carried by one end of each rod, and clamping meanscarried by the block engaging the fiat surfaces of the rods toadjustably secure said rods in said openings while simultaneouslyholding said article engaging members at right angles to the oppositefaces of the block.

3. A jig as set forth comprising a block member provided with rightangularly related openings therethrough disposed parallel with oppositcfaces of the block, rods disposed in said openngs and projecting beyondthe adjacent edges of the block, each of said rods having a fiatlongitudinally extending surface, a right angularly disposed articleengaging member carried by one end of each rod, threaded clamping meanscarried by the block engaging the fiat surfaces of the rods toadjustably secure said rods in said openings while simultaneouslyholding said article engaging members at right angles to the oppositefaces of the block, said block having a centrally disposed openingtransversely therethrough, and a bushing member engaging in said centralopenmg.

4. A jig as set forth comprising a block, a pair of parallel rodsslidable through said block, a

right angularly disposed member fixed to each rcd at one end thereof, asecond pair of parallel rods slidable through said block and disposedat' right angles to said first pair of rods, a right angularly disposedmember fixed to one end of each of said second pair of rods, clampingmeans carried by said block and engaging said rods for adjustablysecuring said rods relative to said block, and a tool guiding bushingcarried by said block.

ROGER W. BAKER.

